Lathe.



Patented Apr. 9, I90| W. ROBINSON.

LATHE. \Applcation leiiDec. 13, 1900.)

5 Sheets-Sheet l.

(No Modal.)

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Dac.' 13, 1900.)

' 5 Sheets-Sheet 3.

(No Nudel.)

vw/p remore ATTO EVS Patented Apr. 9, |90l.

5 Sheets-Sheet 4.

(No Model.)

W/ TNESSES A TOHNEYS No. 67|,8o6. Patented Apr. 9, mol.

W. ROBINSON.

LATHE.

(Application med Dec. 18, 1900.) (No Model.) 5 Sheets-Sheet 5.

mgl.; By mg A Tron/v5 ysV WILLIAM ROBINSON, OF AURORA, ILLINOIS.

LATH E.

ePncIFIcATIoIv forming part of Letters Patent No. 671,806, dated April 9, 190i.

Application led December 13, i900. -n'erial No. 39.642. (No model.)

T0 all whom if; may concern:

Be it known that l, WILLIAM ROBINSON, a citizen of the United States, and a resident of Aurora, in the county of Kane and State of Illinois, have invented a new and Improved Lathe, of which the following is a full, clear, and exact description.

The invention relates to watchmakers lathes; and its object is to provide a new and improved lathe more especially designed for automatically and accurately turning articles having more than one diameter-mainly balance-staffs, barrel-arbors, center-stads, cannon-pinions, third and fourth escapement-` pinions, pallet-arbors, type-bar pins for typewriting machines, dto.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this speciiication, in which similar characters of reference indicate corresponding parts in all the views.

Figure lis a front elevation of the improvement with parts broken out. Fig. 2 is a plan View of the same with part in section. Fig. ,3 is a transverse section of the same on the line 8 3 in Fig. l. Fig. 4 is a like view of the same on the line 4 4 in Fig. l. Fig. 5 is a front ele- Vation of theimprovementwith parts in section and parts in a diiferent position from the one shown in Fig. 1. Fig. 6 is a transverse section of the wedge-shaped shifting-bar, the section being on the line 6 6in Fig. 5. Fig. 7 is an enlarged face view of the cam-Wheel with the two cams. Fig. Sis a diagrammatic view of the cams unrolled. Fig. 9 is an enlarged sectional side elevation of a staff. Fig. l0 is an enlarged side elevation of the work-holder as arranged for holding the blank for making staffs and the like. Fig. ll is an end view of the sanne. Fig. 12 is a sectional side elevation of the work-holder as arranged for holding the type-bar pins of a type-writing machine, and Fig. I3 is an end view of the same.

The improved lathe is mounted on a suitably-constructed bed A, supporting a headstock B,carrying a Work-holder C,supporting and rotating a rod D, from which the articles are turned by the use of a single pointed tool E, held in the usual manner in a toolpost F, the work being rotated in the holder O by a pulley C', connected by belt with other machinery for imparting a rotary motion to the pulleyand the work,as hereinafter more fully described. The tool-post F has its base F' fulcrumed at F2 on a carriage G, and the said base F' can be readily adjusted by the op-` erator turning a screw F3 to bring the point of the tool in proper position relatively to the work.

The carriage G is formed with a hub G', engaging a spindle H, mounted to turn and to slide longitudinally in bearings A', formed on the hed A, as is plainly indicated in Fig. 2, and one end of said spindle is pressed on by a spring I to normally hold the spindle and the carriage G in a right-hand position. The right-hand end of the spindle I-I engages a screwrod H', screwing in a sleeve H2, mounted to slide longitudinally in a bearing A2, secured to the bed A. On the sleeve H2 is formed a transverse oset H3, supporting a wear-block H4, engaging a circular cam J on the face of a cam-wheel J, secured to and rotating with a driven shaft K, extending longitudinally in suitable bearings arranged on the bed A. When the shaft K is rotated, the rotary motion given to the calnnvheel J causes the cam J' thereof to impart a sliding motion to the wear-block H4, the sleeve H2, the screwrod H', and the spindle H, so that the latter moves against the tension of the spring I and at the same time moves the carriage G from the right to the left to feed the tool E along the work.

According to the shape of the article to be turned, a transverse swinging motion is given to the carriage G, so as to not only turn the work lengthwise, but to give it the desired shape, according to the various diameters of the article to be made. For this purpose the carriage-spindle H carries a yoke L, having a downward connecting-bar L', supporting a wheel L2, traveling on the face of a dat spring L3, held on a removable slide A4, attached to the bed A. (See Figs. 2, 3, and 4.) The yoke L is also provided with a forwardly-extending arm L, in which screws vertically a screwrod L5, supporting at its upper end a wear- IOO AIo

block L5, engaging the under side of a bar N, formed with a plurality of wedges N', engaging corresponding wedges N2 on abar N3, fulcrumed at N4 to the bed A and engaged at its free end by a screw-rod N5, screwing in the bed. A spring N6 is secured to the top of the bar N8 and rests with its free end on the bed A, so as to hold the bar N3 normally in position-that is, with the wedges N2 in engagement with the wedges N of the bar N. The latter is pressed at its left-hand end by a spring N7, attached to the bed A, and the opposite end of the bar is engaged by a foot O', projecting upward from a bar O, mounted to slide in suitable bearings A5, attached to or formed on the bed A. The outer end of the bar O carries a removable head O2, restin-g against the face of a cam J2, formed on the cam-Wheel J and concentric with the cam J', previously mentioned. When the shaft K is rotated, the head O2 in travelingon the face of the cam J2 imparts a sliding motion to the bar O, so that the foot O thereof shifts the bar N to the left against the tension of the spring N7, and the bar N during this movement slides, with its wedges N, over the Wedges N2, whereby the bar N moves downward and moves the wear-block L6 and screwrod L5 in a like direction, thereby giving a swinging motion to the yoke L, so that the spindle H is rocked, and consequently a swinging motion is given to the carriage G, the tool-post F, and the tool E.

The .cams J J2 are arranged according to the shape to be given to the article to be turned by the lathe. For instance, if a balance-staff is to be turned, such as shown in Fig. 9, then the faces of the cams J J2 are arranged asillustrated in Figs. 'Zand 8. When the machine is in operation, the cam J' causes a forward feeding of the carriage G and tooth E to turn the work to agiven diameter-that is, the wear-block H4 travels on a spiral portion of the cam J and causes a sliding from right to left of the spindle H, carriage G, and tool E to turn the work to a given diameter, the removable head O2 during this time traveling on a straight surface on the cam J2, so that no movement whatever is given to the bar N. When the end of this portion of the work has been reached, the wear-block H4 then travels on a straight portion of the cam J', so that the carriage G and tool E remain at a standstill, while the head O2 travels on an inclined portion of the cam J2, and therebyimparts a swinging motion to the carriage G and the tool E to bring the latter to a different position. Soon after this has been done the wear-block H4 again travels on a spiral portion of the cam J', while the removable head O2 travels on a straight or parallel portion of the cam J2. This is repeated for turning the dierent diameters of the staffs, and when a curved portion is to be turned then both cams J J2 are active-that is, impartV sliding motion simultaneously to the wearblock H4 and head H2 to shift the tool E from the right to the left and also give a transverse movement to the tool to give the desired curvature to the article at a particular point.'

It is evident from the foregoing that for differently-shaped articles to be turned different cam -wheels J are employed; but in each case the cams J J2 coact to give the de- 'sired movement at the proper time to the carriage G, so as to turn the article according to the predetermined design without any assist- Vance whatever on the part of the operator.

When the article has been turned throughout its length, as described, then the wear-block H4 and the head O2 have traveled the whole length of their respective cams-that is, the

wheel J has made one revolution-and thenl the springs I and N7 immediately return the spindle H and the bar N and the parts connected therewith to the original rst position, after which the above-described operation is repeated-that is, a second article is turned in precisely the same manner as above described,the work being fed forward the proper distance.

The desired adjustment between the carriage G and the yoke L is made by a suitable screw-rod G2, screwing in a depending arm .G3 of the carriage G, and in said arm is also held a slidable pin G4, pressed on bya spring G5 and engaging the arm L4 of the yoke L. The pin G4 and spring G5 form a yielding connection between the depending arm G3 and the carriage. By this arrangement the operator can readily adj ust the yoke relatively to the carriage G by turning the screw-rod G2 accordingly.

In order to hold the bars N N3 in proper relation to each other, I provide the same with tongue and groove N8, as indicated in Fig. 6.

In a slot K' in the shaft K is held a clutchbar K2, pressed by a spring K3 in engagement with a clutch member P', formed on a worm-wheel P, mounted to rotate loosely on the shaft K and in mesh with a worm P2, (see dotted lines in Fig. 3,) secured on a shaft P5, mounted to turn in suitable bearings on the bed A and carrying a pulley P4, connected by belt with other machinery, so that the rotary motion given to the pulley P4 and shaft P3 is transmitted by the worm P2 to the wormwheel P and by the clutch member P and clutch-bar K2 to the shaft K. A hand-wheel K4 is secured on the outer end of the shaft K, and in this outer end is also mounted loosely a rod K5, adapted to press the clutchbar K2 out of engagement with the clutch member P' whenever it is desired to turn the hand-wheel K4 and the shaft K by hand. In order to do this, it is necessary for the operator to press the handle K6 of the rod K5 in an inward direction to push the clutch-rod K2 out of mesh with the clutch member P and then turn the hand-wheel K4 to rotate the shaft K.

The work-holder C is constructed in detail IIO as follows, reference being had to Figs. l0, 11, 12, and 13: The pulley C of the workholder is secured on a nut C2, screwed or otherwise fastened on a sleeve C3, having a fixed conical head C4 and a loose conical head C5, engaging correspondiugly-shaped ends in the bearing B' of the head -stock B. The head C5 is held in engagement with the bearing B bythe nut C2, and the head C5 is held against turning by a pin Cg'engaging a keyway C8 in the sleeve. On the outer end of the fixed head C5 screws a thim ble C6, through which extends the work D in the shape of a rod to be`turned into staffs or pins-by the tool E, as previously described.

In order to clamp the work in position in the holder during the time the machine is in operation, I provide a centrifugal clamping devicearranged as follows: On the outer face of the pulley C are arranged diametrically oppositely disposed pivots C7, on which are mounted to swing levers Q, formed with their inner ends into points Q', adapted to engage the work D at diametrically opposite points. The levers Q support at their outer ends adjustable weights Q2, which when the pulley C is rotated in the direction of the arrow a Hy outward, and thereby cause the points Ql to firmly grip the work, and thereby hold the same in position during the turning operation. As soon as the article has been turned and the operator stops the lathe the weights Q2 return to their former position and the points Q release the work, so that the latter can be fed forward the desired distance for forming another article. It is understood that the work D extends through the sleeve C3; but when it is desired to face off the ends of the articles turned then such articles D (see Fig. 12) are held at one' endin the thimble C6 and at the other end in a recess in a rod R, extending looselyr in the sleeve C3 and formed at the outer end with a cone-shaped head R', engaged by the beveled inner ends Q3 of the levers Q, previously mentioned, so that when the pulley C is rotated the weights O2 cause the leversto press on the head R', and thereby push the rod R to the right and securely hold the finished article D in position in the thimble, the outer end of the article projecting a suitable distance beyond the thimble for the tool E to finish or face off the ends. When the lathe is stopped after one end of the article is faced oit, then the rod Q releases the article and the latter can be readily removed from the thimble and replaced by another and the above operation repeated.

Having thus fully described my invention, l claim as new and desire to secure by Letters Patentv l. A lathe having a carriage, a spindle carrying said carriage, and mounted to turn and to slide, a yoke on said spindle, revoluble cams, and means actuated by said cams for imparting a sliding motion to the said spindle and a swinging motion to said yoke, the said cams being rotated to impart the desired motion to the carriage for turning the article according to a predetermined design as set forth.

2. Alathe havingacarriage,acarriage-spindle mounted to turn and to slide, a yoke on said spindle, mechanism for im parting a swinging motion to the yoke to rock the spindle and carriage, and cams operating in unison, one for imparting a sliding motion to the spindle and the other actuating the said mechanism to impart a swinging motion to the-yoke, as set forth.

3. A lathe having a carriage, a carriage-spindle mounted to turn and to slide, mechanism as described, for imparting a rocking motion to said spindle, and a cam-wheel having concentric face-cams, one for imparting a sliding motion tothe carriage-spindle and the other for impartinga rocking motion to the spindle, as set forth.

4. A lathe having a `carriage-spindle on which the carriage is secured, the spindle being mounted to turn and to slide, a spring for pressing the spindle in an axial direction, spring-pressed mechanism as described, for imparting a rocking motion to said spindle,

and a cam-wheel having concentric face-cams,

011e for imparting a sliding motion to the carriage-spindle and the other for imparting a rocking motion to the ,spindle by means of said mechanism, as set forth.

. 5. A lathe having a carriage, a spindle carrying said carriage and mounted to slide and lo rock, a yoke on said spindle, a sliding bar having inclines for operating the yoke, a fixed bar on which said sliding bar is movable and having similarly-shaped inclines, a cam for shifting said slidingl bar, and a cam for shifting said spindle, as set forth.

6. A lathe having a tool-carriage, a springpressed spindle carrying said tool-carriage and mounted to slide and to rock, a yoke secured on said spindle, a tixed bar having inclines, a sliding bar having inclines in engagement with the inc-lines on the fixed bar, a springpressing said slidable bar, and a cam- 'wheel having concentric face-cams, one for imparting a sliding motion to said carriage- IOO spindle and the other forimparting a sliding motion to said sliding bar, as set forth.

7. A lathe having a tool-carriage, a spring-` pressed spindle carrying said tool-carriage and mounted to slide and to rock, a yoke secured on said spindle, a xed bar having inclines, a sliding bar havinginclines in engagement with `the inclines on the fixed bar, a spring pressing said slidable bar, a cam-wheel having concentric face-cams, one for im parting a sliding motion to said carriage-spindle and the other for imparting a sliding motion to said sliding bar, and a yielding connection between said yoke and said carriage, as set forth.

8. A lathe having a tool-carriage, a springpressed spindle carrying said tool-carriage and lnounted to slide and to rock, a yoke secured on said spindle, a tixed bar having inclines, a sliding bar having inclines in engagement with the inclines on the xed bar, a spring pressing said slidable bar, a 'camwheel having concentric face-cams, one for imparting a sliding motion to said carriagespindle and the other for imparting a sliding motion to said sliding bar, andv means, substanlially as described, for adjusting said carriage relatively to said yoke, as set forth.

9. A lathe having a carriage, and a cam- Wheel with concentric face-cams, one for imparting a sliding motion to said carriage and the other for imparting a rocking motion thereto, as set forth.

10. A lathe having a cam-Wheel with concentric face-cams, one for imparting a sliding motion to the lathe-carriage and the other for imparting a rocking motion thereto, the cam-face having alternateV parallel and inclined portions but in reverse relation-to each other, as set forth.

l1. A lathe havinga mechanism for imparting a rocking motion to the carriage and comprising a liXed bar With inclines, a sliding bar With inclines'engaging the inclines on the fixed bar, a spring pressingsaid sliding Vbar in one direction, a rod for pressing the sliding bar in an opposite direction, and a camV engaging said rod, as setl forth.

l2. A lathe having a mechanism for imparting a rocking motion to the carriage and comprising a fixed bar With inclines, a sliding bar with inclines engaging the inclines on the fixed bar, as-pring pressing said sliding bar in. one direction, arod for pressing the sliding bar in an opposite direction, acam engaging said rod, and aV yoke having an adj ustable connection with said sliding bar and attached to the spindle of the carriage, as set forth.

13. A lathe havinga carriage, a spindle carrying said carriage and mountedtoslide and to rock, a yoke on said spindle, a sliding bar having inclines for operating the yoke, a fixed bar on which said sliding bar is movable and having similarly-shaped inclines, means for actuating said sliding bar, and means for shifting said spindle, as set forth.

14. Alathe havinga carriage provided With a hub, a spindle engaged by said hub and `mounted to slide and to rock, a spring engag- `spindle and provided with a projecting'arm,

mechanism for moving thesaid arm torock the spindle, arod mounted to slide and arranged to actuate said mechanism, andmeans for operating said rod, as set forth.

16. A lathe, comprising a Work-holder, a carriage, a tool-holder mounted on the carriage, a spindle carrying said carriage and `mounted to turn and to slide, a yoke on said spindle, means for adjusting the yoke relatively to the carriage, mechanism for swinging the said yoke to impart a rocking motion tothe spindle and carriage, and means for imparting a sliding motion to the spindle as set' forth.

In testimony whereof I have signed my name to thisspecification in the presence of two subscribing Witness-es.

WILLIAM ROBINSON.

Witnesses:

R. W. GATES, THEoDoRE WORCESTER; 

